Protective switch box



Oct. 15, 1929. A. E. BLACKMAN PROTECTIVE SWITCH Box Filed June 25. 1926 awweutoz 3.51 his Gnome/1;

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PATENT OFFIQE PROTECTIVE SWITCH BOX Application filed June 25, 1926. Serial No. 118,474.

This invention relates to a switch box so constructed that when the switch is closed the cover cannot be opened. The switch blade is so mounted that its axis of rotation 'is substantially perpendicular to the fuse block instead of parallel thereto as is often found in switch boxes. This permits of a shallow box, saving metal and requiring a shallower recess in the wall. Further the handle and switch crank are made of a bent rod easily insertible into its hearings in the box. The bearings consist of a bracket fastened to one wall of the box, said bracket being formed of two pieces for permitting the assembling of the one piece handle and switch crank. The switch clip construction comprises two jaws, each aw being bent over upon itself to form a U.

These and other objects and advantages will become apparent upon a study of the description and drawing in which :Fig. 1 is a cross-section along the line 11 of Fig. 2, part of the switch blade being broken away to show the switch clip. Fig. 2 is a front elevation of the box, Fig. 3 is a section and partial elevation along the line 33 of Fig. 2, Fig. 4 is a partial section along the line H of Fig. 2 showing the fuse block in elevation, and Fig. 5 is a perspective view of the one piece handle and switch crank.

The fuse block 6 is enclosed in a sheet metal case comprising a body 7 and a cover 8 hinged at 12 thereto. Fuse block 6 is fastened to the back wall of body 7.

The handle 9 is preferably integral with switch crank 10, both being formed of a rod suitably bent. Portion 11, of handle 9, is pivotally mounted in spaced brackets 13 and 14 fastened to the side of case 7 Two separate brackets are used to enable the assembly of the integral switch crank 10 and handle 9 in said brackets. Switch crank 10 is provided with "a right angled projection 15 adapted insulatively to engage switch blade or contact arm 16. The connection between projection 15 and switch blade 16 is made through insulating block 17 which is fastened by rivet 18 to switch blade 16. Switch blade 16 is mounted on ivot 20 which is coincident with the longitu incl axis of portion 11 of:

handle 9, said pivot being supported in bracket 19 which is in electrical connection with fuse 21 through metallic connections not shown but well known to the art. Bracket 19 is fixedly mounted on fuse block 6.

lVhen handle 9 is rotated to the left (dotted position in Fig. 2), switch blade 16 comes between the switch clip comprising jaws 26 and 22. Jaws 26 and 22 are bent over upon themselves to form U shaped ends. Said jaws are fastened to each other and to fuse block 6 as well as lead wire 23 by means of screw 24.

When switch blade 16 engages jaws 26 and 22 the circuit is closed between lead wire 25, fuse 21, bracket 19, switch blade 16, switch clip jaws 26 and 22 and lead wire 23.

lVhen switch blade 16 is to the left of the position shown in Fig. 2, it is not possible to open cover 8 as handle 9 is in the way. YVith the switch entirely open, handle 9 is in the position shown in Fig. 2, a slot 27 in cover 8 being in alignment with said handle and permitting the opening of the cover. Bracket 13 serves to block up the opening in the cover 8 left by slot 27.

It is to be noted that the bends in the in tegral handle 9 and switch crank 10 are substantially at right angles to each other.

I claim 1. An electric appliance comprising a case, switch terminals insulatively mounted upon a wall of said case, a switch blade pivotally mounted within said case, adapted to open and close the circuit between said terminals, the pivotal axis of said blade being substantially perpendicular to said wall, a switch crank within the case and a handle therefor external of said case for swinging said blade, said handle extending through said case to join with the crank, the pivotal axis of said crank and handle being coincident with that of said blade, said crank having its inner end bent toward an intermediate point of said blade, an insulating block between said end and the blade on one side engaging said end. and means fastening said blade to said block on its other side.

2. An electric appliance comprising a case having a movable cover, switch terminals insulatively mounted in said case, a switch blade pivotally mounted within said case adapted to open and close the circuit between said terminals, the pivotal axis of said blade being substantially parallel to a wall of said case, a switch crank within the case, and a handle therefor external of said cover when closed, for swinging said blade, bracket means mounted on said wall of the case, said wall being adjacent to the. cover when closed, said handle extending through the cover in closed position to its junction with the crank, the portion of said handle extending through the corerbeing substantially'parall'el to said wall and pivotally mounted in said bracket means, the longitudinal axis of said portion serving as the pivotal axis of the crank' and handle and being coincident with the pivotal axis of the switch blade.

3. An electric appliance comprising a case, switch terminals insulatively mounted in said case, a switch blade pivotally mount ed within said case adapted to open and close the circuit between said terminals, the pivotal axis of said blade being substantially parallel to one wall of said case, a switch crank within the case, and a handle therefor external of said case for swinging said blade, said handle having a portion extending through a secondwall of the case to itsjunction with the crank, said second wall being at a substantial angle with the first, the portion of said handle extending through said second wall being pivotally mounted on said'lirst wallsubstantially parallel thereto, the longitudinal axis of said portion serving as the pivotal axis of the crank and handle and being coincident with the pivotal axis of the switch blade. 7

l. An electric appliance comprising a case,

' cuit between said terminals the jiv'otal axis of said blade being substantially parallel to one wall-otsaid'case,a switch crank within the case, and a handle therefor external of said case for swinging said blade, said crank and handle being integral, a portion of the handle ext nding through a second wall of the case to its junction with the crank, said second wall being at a substantial angle with tho first theportion 0tsaid handle extending through said second wall being substantially parallel to the first wall, and a bracket fastened inside said casing comprising spaced members provided with holes a in parallel ali nment-to said firstwall, said portion passing through the holes, whereby'said bracket is adapted pivotally to support said portion, said members being removably fastened to each other'to permit assembling of the integral crank and handle in saidbracket, the longitudinal axis of said portion serving as d v the pivotal axis of the crank and handle and being coincident with the pivotal axis of the switch blade.

5. An electric appliance comprising a case having a movable cover, switch terminals insulatively mounted on the back wall of said case, a switch blade pivotally mounted within said case adapted to open and close the circuit between said terminals, the pivotal axis of v said blade being substantially perpendicular to said back wall, a switch crank within the case, and a handle therefor external of said cover when closed, for swinging said blade, said handle extending through the cover in closed position to its junction with the crank, the portion of said handle, extending through the cover, being pivotally nounted upon the inside of and substantially parallel to one of the walls which extend between the back wall and the cover when the latter is'closed, the longitudinal axis ofsaid portion serving as the pivotal axis of the crank and handle and being coincident with the'pivotal axis of the switch blade. 7 i

6. An electricappliance comprising a case having a movable cover, switch terminals insulatively mounted on the back wall of said case, a switch blade adapted to open and close the circuit between said terminals, a switch crank, within the case, upon-which said blade is supported, and a handle for the switch crank external of the cover when closed, for swinging said blade, said handle extending through the cover in closed position to its junction with the crank, theportion of said handle, extending through the cover, being rot'atably mounted upon the inside of and substantially parallel to one of the walls which extend between the back wall and the cover when the latter is closed, said portion servingas pivot for the crank, handle and switch blade. l i

7 An electric appliance comprising a case, switch terminals insulatively mounted in said case, a switch blade pivotally mounted within saidcase adaptedto open and close the circuit between said terminals, the pivotal axis of said blade being substantially parallel" to one wall'ot said case, a switch crank within the case, and a handle therefor external of said case 'forswinging said blade,said crank and handle being integral, a portion of the handle extending through a second wall of the case to its unction with the crank, said second wall being at a. substantial angle with the first, the portion of the handle extending through said second wall being substantially parallel to the first wall, and a bracket has ids tened upon said first wall inside said casing comprising spaced: members provided with holes in parallel alignment to said first wall, said portion passing through the holes, whereby said bracket is adopted pivotally to support said portion, said members being re-j movably fastened to saidfirstwall andisepa'rable from each other to permit assembling of the integral crank and handle in said bracket, the longitudinal axis of said portion serving as the pivotal axis of the crank and handle and being coincident With the pivotal axis of the switch blade.

ALBERT EDGAR BLACKMAN. 

